Sound reproduction system

ABSTRACT

A plurality of generally tubular members of corrugated fiberboard, each rectangular in transverse cross-section and including four panels, are nested one within the other to form a closed six-walled housing, each wall comprising back-to-back panels secured together with the corrugations thereof extending in mutually perpendicular directions, each tubular member being formed of a continuous sheet of fiberboard folded to the tubular configuration and having opposite side edges thereof joined together to form a seam disposed centrally of one of said panels. One form of the invention comprises three tubular members nested together with the axes thereof mutually perpendicular. Another form of the invention comprises two tubular members nested together coaxially, with the inner member having four end flaps at each end thereof disposed in use in a folded configuration wherein opposed flaps are coplanar and joined together to form back-to-back end panels at each end of the tubular member for closing same.

United States Patent 11 1 Everitt Feb. 5, 1974 [73] Assignee: AccousticFiber Sound Systems, Inc.,

Indianapolis, Ind.

221 Filed: Jan. 31, 1972 211 Appl. No.: 222,262

[75] Inventor:

[57] ABSTRACT A plurality of generally tubular members of corrugatedfiberboard, each rectangular in transverse crosssection and includingfour panels, are nested one within the other to form a closed six'walledhousing, each wall comprising back-to-back panels secured together withthe corrugations thereof extending in mutually perpendicular directions,each tubular member being formed of a continuous sheet of fiberboard[52] US. Cl 181/31 B folded to the tubular configuration and havingoppo- [51] Int. Cl G10k 13/00, H041 1/28 site side edges thereof joinedtogether to form a seam [58] Field of Search 181/31 B disposed centrallyof one of said panels. One form of the invention comprises three tubularmembers nested [56] eferenc s C te together with the axes thereofmutually perpendicular. UNITED STATES PATENTS Another form of theinvention comprises two tubular 2,041,777 5/1936 Olney et al 181/31 Bmembers nested mgether coaxiany with the inner 2,992,695 7/1961 Everitt181/31 B member having four end flaps at each end thereof 3,s20,55'97/1970 Ross 181/31 B posed in use n a folded configuration wherein op-3,592,290 7/1971 Armstrong 181/31 B posed flaps are coplanar and joinedtogether to form back-to-back end panels at each end of the tubularPrimary Examiner-Stephen J. Tomsky member for closing same. Attorney,Agent, or Firm-David A. Voge] 5 Claims, 7 Drawing Figures 4/ 66 I 0 Q (QZL' I (C I; 48 2 9 49 5 73 7/ .a- 1 i I 7 3 Si: 72 RX 2 -r 35 9- r 5/ 23\2/ I 55 32 f 49 SOUND REPRODUCTION SYSTEM This invention relates to asound reproduction system comprising a loudspeaker enclosure and aloudspeaker mounted therein.

More particularly, the present invention relates to loudspeakerenclosures formed of corrugated board, and is an improvement of theloudspeaker enclosure disclosed in my US. Pat. No. 2,992,695, entitledLoud Speaker Enclosure and issued on July 18, 1961, and of theloudspeaker enclosure disclosed in my copending US. application Ser. No.222,263, entitled Sound Reproduction System, which application isassigned to the assignee of the present invention.

It is a general object of the present invention to provide an improvedloudspeaker enclosure of simple and economical construction whichaffords excellent acoustical characteristics and improved structuralstrength.

It is an important object of the present invention to provide aloudspeaker enclosure comprising a plurality of continuous sheets ofcorrugated material constructed and arranged to define a closed housinghaving a plurality of walls, the housing having an opening therein tofacilitate the emission of sound waves therefrom, each of the housingwalls including back-to-back portions of the sheets with thecorrugations of each of the sheet portions extending perpendicular tothe corrugations of adjacent sheet portions of the wall, each of thesheets having opposite side edges thereof joined together to form a seamdisposed substantially centrally of one of the walls thereby to insurethe integrity of the junctures between the walls, whereby there isprovided a housing of increased structural strength with theperpendicular corrugations of adjacent sheet portions in each housingwall facilitating the suppression by the walls of undesirable soundwaves emitted from the loudspeaker enclosure.

Another object of this invention is to provide a loudspeaker enclosurecomprising three tubular members,

I each formed of one of the sheets of corrugated material folded to atubular configuration substantially rectangular in transversecross-section and including four panels disposed substantially parallelto the longitudinal axis of the tubular member with the seam beingdisposed centrally of one of the panels of the tubular member, thetubular members being disposed in use in an assembled configurationsnugly received one within another and secured together with thelongitudinal axes thereof being mutually perpendicular for forming aclosed housing havingsix walls, each one of the walls comprisingback-to-back panels of different tubular mem bers having thecorrugations thereof mutually perpendicular.

Still another object of the present invention is to provide aloudspeaker enclosure of the type set forth, comprising a closedbox-like member formed of a first continuous sheet of folded corrugatedmaterial and including four side panels and two end panels, each'of theside panels including a single layer of corrugations extending in apredetermined direction, each of the end panels including at least twolayers of corrugations with the corrugations of each layer extending indirections substantially perpendicular to the directions of thecorrugations of adjacent layers of the panel, and a tubular memberformed of a second continuous sheet of corrugated material includingfour side panels and disposed in use in surrounding relationship withthe box-like member and secured thereto with the side panels of thetubular member respectively disposed in back-to-back engagement with theside panels of the box-like member, the corrugations of each of the sidepanels of the tubular member extending in a direction substantiallyperpendicular to the directions of the corrugations of the adjacent sidepanel of the box-like member.

In connection with the foregoing object, it is another object of thepresent invention to provide a loudspeaker enclosure of the type setforth, wherein the box-like member comprises a generally tubular memberof square transverse cross-section, each of the side panels thereofhaving flaps at each end disposed in use in a folded configurationdefining two-ply end walls closing the ends of the tube, the flaps atone end having recesses therein which mate when folded to define theopening in the one end wall.

In connection with the foregoing objects, it is another object of theinvention to provide a sound reproduction system which includes aloudspeaker enclosure of the type set forth, and a loudspeaker mountedin the enclosure in alignment with the opening for radiating frontsoundwaves therethrough and for emitting back sound waves into the enclosure.1

Further features of the invention pertain to the particular arrangementof the parts of the sound reproduction system whereby the above-outlinedand additional operating features thereof are attained.

The invention, both as to its organization and method of operation,together with further objects and advantages thereof, will best beunderstood by reference to the following specification taken inconnection with the accompanying drawings, in which:

FIG. 1 is a front perspective view of a first embodiment of a soundreproduction system and loudspeaker enclosure constructed in accordancewith and embodying the features of the present invention;

FIG. 2 is an enlarged view in vertical section taken along the line 22in FIG. 1, with the mounted position of the loudspeaker and electricalconductor being illustrated in broken line;

FIG. 3 is an exploded view of the loudspeaker enclosure of FIGS. 1 and2, indicating the manner in which the parts of the loudspeaker enclosureare assembled;

FIG. 4 is a front perspective view, similar to FIG. 1, of a secondembodiment of a sound reproduction system and loudspeaker enclousreconstructed in accordance with and embodying the features of the presentinvention;

FIG. 5 is a view in vertical section taken along the line 5-5 in FIG. 4,with the mounted position of the loudspeaker and electrical conductorbeing illustrated in broken line;

FIG. 6 is a front perspective view of the inner tubular member of theloudspeaker enclosure of FIG. 4, with the end flaps open; and

FIG. 7 is an exploded view of the loudspeaker enclosure of FIG. 4,indicating the relationship of the various parts of the loudspeakerenclosure, and showing the inner tubular member with the end flapsclosed.

Referring now to FIGS. 1 through 3 of the drawings, there is illustrateda sound reproduction system, generally designated by the numeral 90,including a loudspeaker enclosure 10 having a loudspeaker mountedtherein. The loudspeaker enclosure 10 is preferably in the shape of arectangular parallelepiped and includes a top wall 11, a bottom wall 12,a front wall 13, a rear wall 14, and a pair of opposedside walls 16 and17, all of which cooperate to form a closed housing 15. The housing isformed of three generally tubular members, including an inner tubularmember 20, an intermediate tubular member 30 and an outer tubular member40, all nested together in an assembled configuration to form the closedhousing 15. Each of the tubular members 20, 30 and 40 is formed ofcorrugated material, preferably corrugated paper board or fiberboard,each of the tubular members 20, 30 and 40 being formed of a singlecontinuous sheet of the corrugated paper board, folded to the desiredtubular configuration.

More particularly, the inner tubular member 20 is constructed of asingle continuous sheet of corrugated paper board, folded into a tubularconfiguration substantially rectangular in transverse cross-section,thereby to form a front panel 23, a rear panel 24, and a pair of opposedside panels 26 and 27, opposed side edges of the corrugated sheet beingjoined together, as by suitable adhesive such as glue, to form a seamextending longitudinally of the inner tubular member 20 substantiallycentrally of the rear panel 24. Thus, it will be seen that the innertubular member 20 comprises an open-ended rectangular tube with thelongitudinal axis thereof disposed in use substantially vertically, thecorrugations of the inner tubular member 20 extending in directionssubstantially perpendicular to the longitudinal axis thereof, asindicated by the double-ended arrows in FIG. 3. Formed in the frontpanel 23 of the inner tubular member 20 is a relatively large circularspeaker opening 28 and a rectangular reflex port 29, while there isformed in the rear panel 24 a small circular connector opening (notshown), all for a purpose to be explained more fully below.

The intermediate tubular member 30 is formed of a single continuoussheet of corrugated paper board folded to form a tube substantiallyrectangular in transverse cross-section and arranged with thelongitudinal axis thereof disposed in use substantially horizontally.More particularly, the intermediate tubular member 30 includes a toppanel 31, a bottom panel 32, a front panel 33 and a rear panel 34, withopposed side edges of the corrugated sheets being joined together, as bya suitable adhesive such as glue, to form a seam 35 extendinglongitudinally of the tubular member 30 substantially centrally of therear panel 34 thereof. The corrugations of the intermediate tubularmember 30 are arranged to extend in directions substantially normal ofthe longitudinal axis thereof, as indicated by the double-ended arrowsin FIG; 3. The front panel 33 of the intermediate tubular member 30 hasformed therein a relatively large circular speaker opening 38 and arectangular reflex opening 39, the openings 38 and 39 being respectivelyidentical in configuration and position to the openings 28 and 29 in theinner tubular member 20. Further, the rear panel 34 has formed therein arelatively small connector opening (not shown).

The outer tubular member 40 is also formed of a single continuous sheetof corrugated paper board folded to form an open-ended tubesubstantially rectangular in transverse cross-section. Moreparticularly, the outer tubular member40 includes a top panel 41, abottom panel 42, and a pair of opposed side panels 46 and 47, withopposite side edges of the corrugated sheet being joined together, as bya suitable adhesive such as glue,

to form a seam 45 extending longitudinally of the outer tubular member40 substantially centrally of the bottom panel 42. The corrugations ofthe outer tubular member 40 are arranged to extend in directionssubstantially perpendicular to the longitudinal axis thereof, asindicated by the double-ended arrows in FIG. 3.

It is a significant feature of the present invention that in each of thetubular members 20, 30 and 40, the seam is located approximatelycentrally of one of the rectangular panels formed by the tubular member.More particularly, the seam 25 in the inner tubular member 20 isdisposed centrally of the rear panel 24 thereof, the seam 35 of theintermediate tubular member 30 is disposed centrally of the rear panel34 thereof, and the seam 45 of the outer tubular member 40 is disposedcentrally of the bottom panel 42 thereof. The location of seams awayfrom the comers of tubular members 20, 30 and 40 serves to insure thestructural integrity of the junctures between adjacent panels of each ofthe tubular members under nonnal wear and tear conditions for theloudspeaker enclosure 10. In addition, it will be noted that when thetubular members 20, 30 and 40 are nested together in the assembledconfiguration thereof, the seams 25 and 35 in the back-to-back rearpanels 24 and 34 will be disposed perpendicular to each other, therebyto insure the integrity of the seams and of the rear wall 14 of theclosed housing 15.

In assembling the closed housing 15 of the loudspeaker enclosure 10, theinner tubular member 20 may be inserted within the intermediate tubularmember 30, as indicated by the solid arrow in FIG. 3, the intermediatetubular member 30 being dimensioned to receive the inner tubular member20 therein in a snug sliding fit. When the tubular members 20 and 30 arethus nested together, the top and bottom panels 31 and 32 of theintermediate tubular member 30 respectively close the open top andbottom ends of the inner tubular member 20, while the opposed sidepanels 26 and 27 of the inner tubular member 20 respectively close theopen sides of the intermediate tubular member 30. Furthermore, when thetubular members 20 and 30 are nested together in the manner described,the front panels 23 and 33 thereof will be disposed in back-to-backengagement with each other to form the front wall 13 of the closedhousing 15, and the rear panels 24 and 34 will likewise be disposed inback-to-back engagement with each other to form the rear wall 14 of theclosed housing 15. The speaker opening 28 and reflex port 29 of theinner tubular member 20 will be congruent with the speaker opening 38and the reflex port 39 of the intermediate tubular member 30. Similarly,the connector openings in the rear panels 24 and 34 will also bedisposed in axial alignment with each other. The front panels 23 and 33are secured together by any suitable means, preferably by face gluing,the rear panels 24 and 34 being secured together in like manner.

It will be noted that when the inner tubular member 20 is nested withinthe intermediate tubular member 30 in the manner described thecorrugations of the backto-back front panels 23 and 33 will be disposedperpendicular to each other and, likewise, the corrugations of theback-to-back rear panels 24 and 34 will be disposed perpendicular toeach other, whereby each of the front and rear walls 13 and 14 of theclosing housing 15 comprises a criss-cross pattern of corrugations.Further, it

will be noted that the seam 35 of the intermediate tubular member 30 isdisposed substantially perpendicular to the seam of the inner tubularmember 20.

The intermediate tubular member 30, with the inner tubular member 20nested therewithin, may be inserted into the outer tubular member 40, asindicated by the solid arrow in FIG. 3, the outer tubular member 40being dimensioned to receive the intermediate tubular member therein ina snug sliding fit. The top and bottom panels 41 and 42 and the sidepanels 46 and 47 of the outer tubular member are also dimensioned toextend a predetermined distance forwardly and rearwardly beyond thefront and rear panels 33 and 34 of the intermediate tubular member 30,when the intermediate tubular member 30 is nested within the outertubular member 40 in the assembled configuration, thereby to form afront recess 48 and a rear recess 49, as indicated in FIG. 2 of thedrawings.

When the tubular members 20, 30 and 40 are thus assembled, the top andbottom panels 31 and 32 of the intermediate tubular member 30 willrespectively be disposed in back-to-back engagement with the top andbottom panels 41 and 42 of the outer tubular member 40, thereby to formthe top and bottom walls 11 and 12 of the closed housing 15, with thecorrugations of the top and bottom panels 31 and 32 being respectivelydisposed substantially perpendicular to the corrugations of the top andbottom panels 41 and 42. Similarly, the opposed side panels 26 and 27 ofthe inner tubular member 20 are respectively disposed in back-to-backengagement with the opposed side panels 46 and 47 of the outer tubularmember 40, thereby to form the side walls 16 and 17 of the closedhousing 15, with the corrugations of the side panels 26 and 27 beingrespectively disposed perpendicular to the corrugations of the sidepanels 46 and 47. Thus, each of the top and bottom walls 11 ans l2 andthe opposed side walls 16 and 17 of the closed-housing 15 comprisescriss-cross layers of corrugations, the back-to-back panels of each ofthese walls being secured together by any suitable means, such as facegluing, to form a rigid unitary structure.

There is also provided a rectangular loudspeakermounting or baffle boardgenerally designated by the numeral 50, having a front surface 52, arear surface 53 and a peripheral side surface 54 and adapted to bereceived in the front recess 48 of the closed housing 15 substantiallycongruent with the front wall 13. The baffle board 50 is provided with acircular loudspeaker opening 51 and a rectangular reflex port 56therein, the opening 51 and port 56 being respectively disposed in usein axial alignment with the openings 28 and 30 and ports 29 and 39 inthe front wall 13 of the closed housing 15. However, the opening 51 hasa diameter somewhat smaller than the diameters of the aligned openings28 and 38. A grille cloth of sound-transmitting fabric material coversthe front surface 52 of the baffle board 50, the grille cloth 55preferably being stretched over the peripheral side surface 54 of thebaffle board 50 and secured thereto by suitable means, whereby thegrille cloth 55 conceals the speaker opening 51 and the reflex port 56.While the baffle board 50 is preferably constructed of plywood, it willbe appreciated that any other suitable material such as solid wood,particleboard, flakeboard, pressed fiberboard, composition .board orplastic, either foamed or solid, or corrugated board may also be used.

There is also provided a rectangular rear cover panel 60 formed ofcorrugated board and adapted to be re-' ceived in the rear recess 49 ofthe closed housing 15 for covering the rear wall 14 thereof, the rearcover panel 60 being secured to the rear wall 14 by any suitable means,such as face gluing. The rear cover panel 60 is provided with a smallcircular connector opening (not shown) therein, disposed in use in axialalignment with the connector openings'in the rear wall 14.

Preferably, the top and bottom walls 11 and 12, the side walls 16 and 17and the rear cover panel 60 of the speaker enclosure 10 are covered by adecorative facing of any desired material. More particularly, the rearsurface of the rear cover panel 60 is covered by a decorative facingsheet 65 secured thereto by a suitable adhesive, while the outersurfaces of the top and bottom walls 11 and 12 and the side walls 16 and17 are all covered by a single continuous decorative facing sheet 66with opposed side edges thereof joined together to form a seamsubstantially along the seam 45 in the bottom panel 42 of the outertubular member 40. The front and rear edges of the decorative facingsheet 66 are respectively wrapped around the overhanging front and rearmargins of the panels 41, 42, 46 and 47 of the outer tubular member 40which define the front and rear recesses 48 and 49, for completelycovering these overhanging portions as is best shown in FIG. 2. Thedecorative facing sheet 66 is secured to the outer tubular member 40 bysuitable means such as face gluing.

In the preferred embodiment of the present invention, the decorativefacing sheets 65 and 66 are formed of suitably covered vinyl material,but it will be appreciated that any desired material may be used. Thus,it is anticipated that such materials as patterned paper or vinyls,either supported or non-supported, wood veneers, metal, plastics, eitherflexible or rigid, cloth, non-woven materials, leather, furs, foams,stone veneers, various woven or metal fabrics and materials, cork, glassor painted or sprayed materials may be used to form the decorativefacing sheets 65 and 66 to suit the needs and desires of individualcustomers.

A loudspeaker, generally designated by the numeral 70, is mounted withinthe loudspeaker enclosure 10. While the loudspeaker 70 may be of anydesired type such as electrostatic, cone-type, etc., for purposes ofillustration a cone-type loudspeaker is shown, including anelectromagnet structure 71, and a cone-shaped diaphragm 72 provided atthe open end thereof with one or more mounting flanges 73 extendingradially outwardly therefrom. In use, the mounting flanges 73 aresecured to the inner surface 53 of the baffle board 50 by a suitableadhesive or by any other desired means, such as screws, bolts, staples,clips and the like, with the diaphargm 72 disposed in axial alignmentwith the speaker opening 51 in the baffle board 50 and extendingrearwardly therefrom, as is more clearly shown in the aforementionedcopending application Ser. No. 222,263. When the baffle board 50 ismounted in the front recess 48, as described above, the speakerdiaphragm 72 will extend inwardly through the speaker openings 28 and 38in the front wall 13, whereby sound waves generated at the front surfaceof the diaphragm 72 will be radiated outwardly through the alignedspeaker openings 28, 38 and 51 to the exterior of the loudspeakerenclosure 10, while sound waves generated at the rear surface of thediaphragm 72 will be transmitted into the closed housing 15. Atpredetermined frequencies, these back sound waves will be radiatedoutwardly through the aligned reflex ports 29, 39 and 56 in a well-knownmanner, while at other frequencies these back sound waves will besubstantially suppressed by the walls of the loudspeaker enclosure 10,as will be explained more fully hereinafter.

Alternatively, the speaker flanges may be sandwiched between the frontpanels 23 and 33 of the front wall 13 in such a way that the speakermounting flanges are adhesively bonded or otherwise firmly supported andsecured between these panels, thus holding the loudspeaker 70 rigidly inposition in the speaker openings provided. Other alternativearrangements disclosed in my aforementioned copending U.S. applicationSer. No. 222,263, may also be used. In this case, the baffle board maybe eliminated and the grille cloth 55 may be mounted on a suitable pador frame disposed in the front recess 48. Also, a baffle board ofcorrugated fiberboard having a recess in the rear surface thereof insurrounding relationship with the loudspeaker opening for receiving byloudspeaker mounting flanges may also be used, which arrangement isdisclosed in greater detail in my aforementioned copending U.S.application Ser. No. 222,263. It will, of course, also be appreciatedthat, if desired, the mounting flanges 73 may be secured to the innersurface of the front wall 13, in the manner disclosed in theaforementioned U.S. Pat. No. 2,992,695.

The electromagnet structure 71 of the loudspeaker 70 is connected by aconductor 74 to a connector (not shown) mounted in the rear wall 14 ofthe loudspeaker enclosure 10, and adapted to be connected to anassociated source of electrical signal power. The structure and mountingarrangement of a preferred embodiment of such a connector is disclosedin my aforementioned copending application, Ser. No. 222,263.

In the preferred embodiment of the invention, as was described above,each of the walls of the closed housing 15 comprises two layers ofcorrugated paper board or fiberboard, the corrugations of which layersare disposed in directions perpendicular to each other. Each of theselayers of corrugated paper board thereby serves to align incident soundwaves in the direction of the corrugations, whereby the sound waves arealigned in mutually perpendicular directions in the two layers ofcorrugations in each wall of the closed housing 15, the net effect beingsubstantially to cancel out the transmission of audible sound wavesthrough the combined layers of corrugated material. Thus, thiscrisscross pattern of corrugations serves to effect suppression of thoseundesirable sound waves generated within the loudspeaker enclosure 10which are not radiated outwardly through the reflex port, and to preventgeneration of undesirable audible sound waves by the walls of theenclosure itself.

It will, of course, be appreciated that the loudspeaker enclosures ofthe present invention may be provided with a plurality of loudspeakeropenings therein for respectively accommodating a plurality of differentloudspeakers in more complex speaker systems. It will also beappreciated that the reflex ports 56 may be eliminated or additionalreflex ports may be added as desired to meet the requirements of anyspecific sound system. Furthermore, it will be understood that thedescription of the assembly of the parts of the loudspeaker enclosureherein is simply for purposes of illustration and that other methods offorming the loudspeaker enclosures of the present invention may in factbe used.

Referring now to FIGS. 4 through 7 of the drawings, there is illustrateda second embodiment of the sound reproduction system of the presentinvention, generally designated by the numeral 100. The soundreproduction system 100 includes a loudspeaker enclosure, generallydesignated by the numeral 110, having a loudspeaker 170 mounted therein.The loudspeaker enclosure 110 is in the shape of a rectangularparallelepiped which is substantially square in transverse crosssection.Preferably, the loudspeaker enclosure 110 is in the shape of a cube andincludes a top wall 111, a bottom wall 112, a front wall 113, a rearwall 114, and a pair of opposed side walls 116 and 1 17, all of whichcooperate to form a closed housing 115. The housing 1 15 is formed oftwo generally tubular members, including an inner tubular member 120 andan outer tubular member 140, nested together in an assembledconfiguration to form the closed housing 115. Each of the generallytubular members 120 and 140 is formed of corrugated material, preferablycorrugated paperboard or fiberboard, each of the tubular members 120 and140 being formed of a single continuous sheet of corrugated paperboard,folded to the desired configuration.

More particularly, the inner tubular member 120 is constructed of asingle continuous sheet of corrugated paperboard, folded into a tubularconfiguration essentially square in transverse cross-section, thereby toform a top panel 121, a bottom panel 122, and a pair of opposed sidepanels 126 and 127, opposed side edges of the corrugated sheet beingjoined together, as by taping, to form a seam 125 extendinglongitudinally of the inner tubular member 120 on any one of the cornersthereof, such as the juncture between the top panel 121 and the sidepanel 127. Thus, it will be seen that the panels 121, 122, 126 and 127cooperate to define an open-ended rectangular tube with the longitudinalaxis thereof disposed in use substantially horizon.- tally, thecorrugations of the inner tubular member 120 extending in directionssubstantially parallel to the Iongitudinal axis of the inner tubularmember 120, as indicated by the double-ended arrows in FIGS. 6 and 7.

Integral with each of the top and bottom panels 121 and 122 at theopposite ends thereof respectively, are a front flap 132 and a rear flap136, each of the flaps 132 and 136 being generally rectangular in shapeand having a width substantially equal to the width of the associatedpanel 121 or 122 and extending therefrom a distance substantially equalto one-half the width thereof. In like manner, integral with each of theside walls 126 and 127 at the opposite ends thereof respectively, are afront flap 133 and a rear flap 137, the front flaps 133 being shaped anddimensioned substantially identically to the front flaps 132 and therear flaps 137 being shaped and dimensioned substantially identically tothe rear flaps 136. Each of the front flaps 132 and 133 has formedtherein centrally of the free edge thereof, a relatively largesemi-circular recess 139, while each of the rear flaps 137 and 136 hasformed therein centrally of the free edge thereof a relatively smallsemicircular recess 138. It will be noted that, as indicated above, theinner tubular member is integrally formed of a single continuous sheetof corrugated material, the flaps 132, 133, 137 and 136 being formed byappropriately cutting and scoring the corru- 9 gated sheet so that eachof the flaps is hingedly connected to the associated panel.

In use, the flaps 132, 133, 137 and 136 are all folded to theconfiguration illustrated in FIG. 7. More particularly, the front flaps132 are folded inwardly to a position wherein they are coplanar witheach other with the free edges thereof abutting. The abutting edges ofthe flaps 132 are then secured together as by gluing to form a seam 123,the coplanar flaps 132 thereby forming a front inner panel 130 forclosing the front end of the inner tubular member 120. In this foldedconfiguration, the semi-circular recesses 139 of the flaps 132 mate todefine a circular opening in the front inner panel 130. The front flaps133 are then folded inwardly to a position wherein they are coplanarwith each other with the free edges thereof abutting, the folded flaps133 overlying the flaps 132 in back-to-back engagement therewith.Preferably, the folded flaps 133 are secured to the outer surface of thefront inner panel 130 as by face gluing and the abutting edges of theflaps 133 are secured together as by gluing to form a seam 124, thecoplanar flaps 133 thereby forming a front outer panel 131 cooperatingwith the front inner panel 130 to form the front wall 113 of the closedhousing 115. In this folded configuration, the recesses 139 of the flaps133 mate to form a circular opening in the front outer panel 131 whichis congruent with the corresponding opening in the front inner panel130, and cooperates therewith to form a loudspeaker opening 119 in thefront wall 113 of the housing 115.

In like manner, the rear flaps 136 are folded inwardly in use to aposition wherein the flaps 136 are coplanar with each other with thefree edges thereof abutting. These abutting free edges are joinedtogether as by gluing to form a seam 128, the coplanar flaps 136 therebyforming a rear inner panel closing the rear end of the tubular member120. In this folded configuration, the semi-circular recesses 138 mateto define a small circular opening through the rear inner panel 134. Theflaps 137 are then folded inwardly to a position wherein the flaps 137are coplanar with each other and overlie the rear inner panel 134 inback-to-back engagement therewith. Preferably, the rear flaps 137 aresecured to the outer surface of the rear inner panel 134 as by facegluing, the flaps 137 being secured together along the free edgesthereof to form a seam 129, the coplanar flaps 137 thereby forming arear outer panel 135 which cooperates with the rear inner panel 134 toform the rear wall 114 of the closed housing 115. In this foldedconfiguration, the recesses 138 in the flaps 137 mate to form a smallcircular opening through the rear outer panel 135 which is congruentwith the corresponding opening in the rear inner panel 134 andcooperates therewith to form a connector opening 118 in the rear wall114 of the housing 115.

It will be noted that when the inner tubular member 120 has the flapsthereof disposed in the folded configuration illustrated in FIG. 7, thecorrugations of the front inner panel 130 extend vertically while thecorrugations of the front outer panel 131 extend horizontally. In likemanner, the corrugations of the rear inner panel 134 extend vertically,while the corrugations of the rear outer panel 135 extend horizontally.Thus, it will be appreciated that each of the front walls 113 and 114 ofthe closed housing 115 comprises two panels of corrugated materialhaving the corrugations thereof disposed perpendicular to eachother tothereby provide a criss-cross pattern of corrugations to facilitate thesuppression of undesirable sound waves by the front and rear walls 113and 114.

The outer tubular member 140 is also formed of a single continuous sheetof corrugated paperboard folded to form an open-ended tube substantiallyrectangular in transverse cross-section. More particularly, the outertubular member 140 includes a top panel 141, a bottom panel 142, and apair of opposed side panels 146 and 147, with opposite side edges of thecorrugated sheet being joined together, as by a suitable adhesive suchas glue, to form a seam 145 extending longitudinally of the outertubular member 140 substantially centrally of the bottom panel 142thereof. The corrugations of the outer tubular member 140 are arrangedto extend in directions substantially perpendicular to the longitudinalaxis thereof, as indicated by the double-ended arrows in FIG. 7.

In assembling the closed housing 115 of the loudspeaker enclosure 110,the inner tubular member may be folded to the cubical configurationillustrated in FIG. 7, as was described above, and inserted within theouter tubular member 140 which is dimensioned to receive the innertubular member 120 therein in a snug sliding fit. When the tubularmembers 120 and 140 are thus nested together in their assembledconfiguration, the top and bottom panels 141 and 142 of the outertubular member 140 will respectively be disposed in back-to-backengagement with the top and bottom panels 121 and 122 of the innertubular member 120 to form the top and bottom walls 111 and 112 of theclosed housing 115. In like manner, the opposed side panels 146 and 147of the outer tubular member 140 will be disposed in back-to-backengagement with the opposed side panels 126 and 127 of the inner tubularmember 120, thereby to form the side walls 116 and 117 of the closedhousing 115. The back-toback panels of the inner and outer tubularmembers 120 and 140 are secured together by any suitable means,preferably by face gluing, to provide a rigid unitary structure for theclosed housing 115.

It will be noted that when the inner tubular member 120 is nested withinthe outer tubular member 140 in the manner described, the corrugationsof the back-toback panels thereof will be disposed perpendicular to eachother, whereby each of the top and bottom and side walls 111, 112, 116and 117 of the closed housing 115 comprises a criss-cross pattern ofcorrugations for facilitating the suppression of undesirable sound wavesemitted from the closed housing 115. Thus, it will be appreciated thatall six walls of the assembled closed housing 115 comprise back-to-backtwo-panel construction having the criss-cross pattern of corrugations,the panels of the front and rear walls 113 and l 14 being formed by thefolded flaps of the inner tubular member 120, as was described above. Itwill be noted that the top and bottom panels 141 and 142 and the sidepanels 146 and 147 of the outer tubular member 140 are dimensioned toextend a predetermined distance forwardly and rearwardly beyond thefront and rear outer panels 131 and of the inner tubular member 120, andcooperate therewith to define a front recess 148 and a rear recess 149,when the tubular members 120 and are nested together in the assembledconfiguration, as indicated in FIG. 5.

There is also provided a substantially square loudspeaker-mounting orbaffle board, generally designated by the numeral 150, having a frontsurface 152, a rear surface 153 and a peripheral side surface 154 andadapted to be received in the front recess 148 of the closed housing 115substantially congruent with the front wall 113 thereof. The baffleboard 150 is provided with a circular loudspeaker opening 151 thereinwhich disposed in use coaxially with the loudspeaker opening 119 formedin the front wall 113 of the closed housing 115. However, the diameterof the opening 151 is less than the diameter of the opening in the frontwall 113. A grille cloth 155 of sound-transmitting fabric materialcovers the front surface 152 of the baffle board 150, the grille cloth155 preferably being stretched over the peripheral side surface 154 ofthe baffle board 150 and secured thereto by suitable means, whereby thegrille cloth 155 conceals the speaker opening 151. While the baffleboard 150 is preferably constructed of plywood, it will be appreciatedthat it may be constructed of other suitable materials such as thosementioned above with respect to the baffle board 50 of the loudspeakerenclosure 10.

There is also provided a substantially square rear cover panel 160formed of corrugated board and adapted to be received in the rear recess149 of the closed housing 115 for covering the rear wall 114 thereof,the rear cover panel 160 being secured to the rear wall 114 by anysuitable means, such as face gluing. The rear cover panel 160 isprovided with a small circular connector opening 168 therein, disposedin use in axial alignment with the connector opening 118 in the rearwall 114 of the closed housing 115.

Preferably, the top and bottom walls 111 and 112 and the side walls 116and 117 and the rear cover panel 160 of the loudspeaker enclosure 110are covered by decorative facing of any desired material. Moreparticularly, the rear surface of the rear cover panel 160 is covered bya decorative facing sheet 165 secured thereto by a suitable adhesive,while the outer surfaces of the top and bottom walls 111 and 112 and theside walls 116 and 117 are all covered by a single continuous decorativefacing sheet 166 with opposed side edges thereof joined together to forma seam, substantially along seam 145 in the bottom panel 142 of theother tubular member 140. The front and rear edges of the decorativefacing sheet 166 are respectively wrapped around the overhanging frontand rear margins of the panels 141, 142, 146 and 147 of the outertubular member 140 which define the front and rear recesses 148 and 149,for completely covering these overhanging portions, as is best shown inFIG. 5. The decorative facing sheet 166 is secured to the outer tubularmember 140 by suitable means such as face gluing. The decorative facingsheets 165 and 166 are preferably formed of vinyl material, but may beformed of any other suitable material, such as those indicated abovewith respect to the decorative facing sheets 65 and 66 of theloudspeaker enclosure 10.

A loudspeaker, generally designated by the numeral 170, is mountedwithin the loudspeaker enclosure 110. While the loudspeaker 170 may beof any desired type, for purposes of illustration a cone-typeloudspeaker is shown, including an electromagnet structure 171 and acone-shaped diaphragm 172 provided at the open end thereof with one ormore mounting flanges 173 extending radially outwardly therefrom. Inuse, the mounting flanges 173 are secured to the inner surface 153 ofthe baffle board 150 by suitable adhesive or by any other desired means,such as screws, bolts, staples, clips and the like, with the diaphragm172 disposed in axial alignement with the loudspeaker opening 151 in thebaffle board 150 and extending rearwardly therefrom, as is more clearlyshown in my aforementioned copending application, Ser. No. 222,263. Whenthe baffle board 150 is mounted in the front recess 148, as describedabove, the loudspeaker diaphragm 172 will extend inwardly through theopening 119 in the front wall 113, whereby sound waves generated at thefront surface of the diaphragm 172 will be radiated outwardly throughthe aligned speaker openings 119 and 159 to the exterior of theloudspeaker enclosure 110, while sound waves generated at the rearsurface of the diaphragm 172 will be transmitted into the closed housing115. Alternative modes of mounting the loudspeaker within the closedhousing 115, as described above with respect to the loudspeakerenclosure 10, may also be used for mounting the loudspeaker 170 in theloudspeaker enclosure 110. The electromagnet structure 171 of theloudspeaker 170 is connected by a conductor 174 to a suitable connector(not shown) mounted in the rear wall 114 of the loudspeaker enclosure110, and'adapted to be connected to an associated source of electricsignal power. The structure and mounting arrangement of a preferredembodiment of such a connector is disclosed in my aforementionedcopending application Ser. No. 222,263.

While in the preferred embodiments of this invention, the tubularmembers 20, 30, 40, and are constructed of paperboard or fiberboard forsimplicity and economy of fabrication, it will be appreciated that othercorrugated materials may be used to produce the same sound deadeningeffect, as long as the adjacent layers of corrugated material have thecorrugations thereof disposed at right angles to each other.

From the foregoing, it will be seen that there has been provided a novelloudspeaker enclosure simply constructed of economical materials, andcomprising a closed housing of corrugated material having a crisscrosspattern of corrugations in each of the housing walls for suppressingundesirable sound waves emitted from the enclosure, the enclosureproviding superior acoustical characteristics while having improvedstructural strength which insures the integrity of the junctures betweenadjacent walls of the housing.

More particularly, there has been provided a novel loudspeaker enclosurewith a plurality of rectangular tubes of corrugated paperboard nestedtogether in an assembled configuration, each of the tubes being formedof a single continuous sheet of corrugated material folded into arectangular tubular configuration and having opposed free edges thereofjoined together to form a longitudinal seam, the seams of each of thetubular members being disposed centrally of one of the rectangularpanels thereof.

In addition, there has been provided a loudspeaker enclosure constructedof two tubular members of square transverse cross-section, the innertubular member having rectangular flaps at the opposite ends of each ofthe four side panels thereof, the flaps being disposed in use in afolded configuration defining front and rear end walls for the innertubular member, each of these end walls comprising two back-to-back endpanels having the corrugations thereof disposed perpendicular to eachother.

While there has been described what are at present considered to be thepreferred embodiments of the present invention, it will be understoodthat various modifications may be made therein, and it is intended tocover in the appended claims all such modifications as fall within thetrue spirit and scope of the invention.

What is claimed is:

l. A loudspeaker enclosure comprising a plurality of continuous sheetsof corrugated material constructed and arranged to define a closedhousing including a top wall and a bottom wall and a front wall and arear wall and a pair of opposed side walls, said front wall having anopening therein to facilitate the emission of sound waves therefrom,each of said walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugation ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear wall thereof and cooperatingtherewith to form a front recess and a rear recess, whereby theperpendicular corrugations in each of said walls cooperate to facilitatethe suppression by said wall of undesirable sound waves emitted fromsaid housing.

2. A loudspeaker enclosure comprising a plurality of continuous sheetsof corrugated material constructed and arranged to define a closedhousing including a top wall and a bottom wall and a front wall and arear wall and a pair of opposed side walls, said front wall having anopening therein to facilitate the emission of sound waves therefrom,each of said walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugations ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear walls thereof and cooperatingtherewith to form a front recess and a rear recess, aloudspeaker-mounting board disposed in said front recess and secured tosaid front wall and having an opening therein aligned with the openingin said front wall for mounting an associated loudspeaker thereon, and arear cover panel disposed in said rear recess and secured to said rearwall, whereby the perpendicular corrugations in each of said wallscooperate to facilitate the suppression by said wall of undesirablesound waves emitted from said housing.

3. A loudspeaker enclosure comprising a plurality of continuous sheetsof corrugated material constructed and arranged to define a closedhousing including a top wall and a bottom wall and a front wall and arear wall and a pair of opposed side walls, said front wall having anopening therein to facilitate the emission of sound waves therefrom,each of said walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the

- corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugations ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear walls thereof and cooperatingtherewith to form a front recess and a rear recess, aloudspeaker-mounting board disposed in said front recess and secured tosaid front wall and having an opening therein aligned with the openingin said front wall for mounting an associated loudspeaker thereon, arear cover panel disposed in said rear recess and secured to said rearwall, a sound-transmitting fabric screen secured to saidloudspeaker-mounting board and covering the outer surface thereof forconcealing the opening therein, and a decorative facing secured to saidtop and bottom and side walls and said rear cover panel and covering theouter surfaces thereof, whereby the perpendicular corrugations in eachof said walls cooperate to facilitate the suppression by said walls ofundesirable sound waves emitted from said housing.

4. A sound reproduction system comprising a plurality of continuoussheets of corrugated material constructed and arranged to define aclosed housing including a top wall and a bottom wall and a front walland a rear wall and a pair of opposed side walls, said front wall havingan opening therein to facilitate the emission of sound waves therefrom,each of said walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugations ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear walls thereof and cooperatingtherewith to form a front recess and a rear recess, aloudspeaker-mounting board disposed in said front recess and secured tosaid front wall and having an opening therein aligned with the openingin said front wall, and a loudspeaker including a cone-shaped diaphragmand having-a mounting flange extending radially outwardly therefrom atthe open end thereof and secured to the rear surface of said loudspeakermounting board, said loudspeaker being disposed in use within saidhousing in axial alignment with said openings for transmittingtherethrough to the exterior of said housing sound waves generaged atthe front surface of the diaphragm and for transmitting into saidhousing sound waves generated at the rear surface of said housing,whereby the perpendicular corrugations of each of said housing wallscooperate to facilitate the suppression by said walls of undesirablesound waves emitted from said housing.

5. A sound reproduction system comprising a plurality of continuoussheets of corrugated material constructed and arranged to define aclosed housing including a top wall and a bottom wall and a front walland a rear wall and a pair of opposed side walls, said front wall havingan opening therein to facilitate the emission of sound waves therefrom,each of said walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugations ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear walls thereof and cooperatingtherewith to form a front recess and a rear recess, aloudspeaker-mounting board disposed in said front recess and secured tosaid front wall and having an opening therein aligned with the openingin said front wall, a loudspeaker including a cone-shaped diaphragm andhaving a mounting flange extending radially outwardly therefrom at theopen end thereof and secured to the rear surface of saidloudspeakermounting board, said loudspeaker being disposed in use withinsaid housing in axial alignment with said openings for transmittingtherethrough to the exterior of said housing sound waves generated atthe front surface of the diaphragm and for transmitting into saidhousing sound waves generated at the rear surface of said housing, arear cover panel disposed in said rear recess and secured to said rearwall, a soundtransmitting fabric screen secured to saidloudspeakermounting board and covering the outer surface thereof forconcealing the opening therein, and a decorative facing secured to saidtop and bottom and side walls and said rear cover panel and covering theouter surfaces thereof, whereby the perpendicular corrugations of eachof said housing walls cooperate to facilitate the suppression by saidwalls of undesirable sound waves emitted from said housing.

1. A loudspeaker enclosure comprising a plurality of continuous sheetsof corrugated material constructed and arranged to define a closedhousing including a top wall and a bottom wall and a front wall and arear wall and a pair of opposed side walls, said front wall having anopening therein to facilitAte the emission of sound waves therefrom,each of said walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugation ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear wall thereof and cooperatingtherewith to form a front recess and a rear recess, whereby theperpendicular corrugations in each of said walls cooperate to facilitatethe suppression by said wall of undesirable sound waves emitted fromsaid housing.
 2. A loudspeaker enclosure comprising a plurality ofcontinuous sheets of corrugated material constructed and arranged todefine a closed housing including a top wall and a bottom wall and afront wall and a rear wall and a pair of opposed side walls, said frontwall having an opening therein to facilitate the emission of sound wavestherefrom, each of said walls being formed of overlying sections of saidsheets of corrugated material and including at least two layers ofcorrugations, the corrugations of each said layer in a wall extending ina direction substantially perpendicular to the direction of thecorrugations of adjacent layers in said wall, each of said sheets havingthe opposite side edges thereof joined together to form a seam disposedsubstantially centrally of one of said walls, at least one layer ofcorrugation of said top and bottom and side walls of said housingextending forwardly and rearwardly beyond the front and rear wallsthereof and cooperating therewith to form a front recess and a rearrecess, a loudspeaker-mounting board disposed in said front recess andsecured to said front wall and having an opening therein aligned withthe opening in said front wall for mounting an associated loudspeakerthereon, and a rear cover panel disposed in said rear recess and securedto said rear wall, whereby the perpendicular corrugations in each ofsaid walls cooperate to facilitate the suppression by said wall ofundesirable sound waves emitted from said housing.
 3. A loudspeakerenclosure comprising a plurality of continuous sheets of corrugatedmaterial constructed and arranged to define a closed housing including atop wall and a bottom wall and a front wall and a rear wall and a pairof opposed side walls, said front wall having an opening therein tofacilitate the emission of sound waves therefrom, each of said wallsbeing formed of overlying sections of said sheets of corrugated materialand including at least two layers of corrugations, the corrugations ofeach said layer in a wall extending in a direction substantiallyperpendicular to the direction of the corrugations of adjacent layers insaid wall, each of said sheets having the opposite side edges thereofjoined together to form a seam disposed substantially centrally of oneof said walls, at least one layer of corrugation of said top and bottomand side walls of said housing extending forwardly and rearwardly beyondthe front and rear walls thereof and cooperating therewith to form afront recess and a rear recess, a loudspeaker-mounting board disposed insaid front recess and secured to said front wall and having an openingtherein aligned with the opening in said front wall for mounting anassociated loudspeaker thereon, a rear cover panel disposed in said rearrecess and secured to said rear wall, a sound-transmitting fabric screensecured to said loudspeaker-mounting board and covering the outersurface thereof for concealing the opening therein, and a decorativefacing secured to said top and bottom and side walls and said rear coverpanel and covering the outer surfaces thereof, whereby the perpendicularcorrugations In each of said walls cooperate to facilitate thesuppression by said walls of undesirable sound waves emitted from saidhousing.
 4. A sound reproduction system comprising a plurality ofcontinuous sheets of corrugated material constructed and arranged todefine a closed housing including a top wall and a bottom wall and afront wall and a rear wall and a pair of opposed side walls, said frontwall having an opening therein to facilitate the emission of sound wavestherefrom, each of said walls being formed of overlying sections of saidsheets of corrugated material and including at least two layers ofcorrugations, the corrugations of each said layer in a wall extending ina direction substantially perpendicular to the direction of thecorrugations of adjacent layers in said wall, each of said sheets havingthe opposite side edges thereof joined together to form a seam disposedsubstantially centrally of one of said walls, at least one layer ofcorrugation of said top and bottom and side walls of said housingextending forwardly and rearwardly beyond the front and rear wallsthereof and cooperating therewith to form a front recess and a rearrecess, a loudspeaker-mounting board disposed in said front recess andsecured to said front wall and having an opening therein aligned withthe opening in said front wall, and a loudspeaker including acone-shaped diaphragm and having a mounting flange extending radiallyoutwardly therefrom at the open end thereof and secured to the rearsurface of said loudspeaker mounting board, said loudspeaker beingdisposed in use within said housing in axial alignment with saidopenings for transmitting therethrough to the exterior of said housingsound waves generaged at the front surface of the diaphragm and fortransmitting into said housing sound waves generated at the rear surfaceof said housing, whereby the perpendicular corrugations of each of saidhousing walls cooperate to facilitate the suppression by said walls ofundesirable sound waves emitted from said housing.
 5. A soundreproduction system comprising a plurality of continuous sheets ofcorrugated material constructed and arranged to define a closed housingincluding a top wall and a bottom wall and a front wall and a rear walland a pair of opposed side walls, said front wall having an openingtherein to facilitate the emission of sound waves therefrom, each ofsaid walls being formed of overlying sections of said sheets ofcorrugated material and including at least two layers of corrugations,the corrugations of each said layer in a wall extending in a directionsubstantially perpendicular to the direction of the corrugations ofadjacent layers in said wall, each of said sheets having the oppositeside edges thereof joined together to form a seam disposed substantiallycentrally of one of said walls, at least one layer of corrugation ofsaid top and bottom and side walls of said housing extending forwardlyand rearwardly beyond the front and rear walls thereof and cooperatingtherewith to form a front recess and a rear recess, aloudspeaker-mounting board disposed in said front recess and secured tosaid front wall and having an opening therein aligned with the openingin said front wall, a loudspeaker including a cone-shaped diaphragm andhaving a mounting flange extending radially outwardly therefrom at theopen end thereof and secured to the rear surface of saidloudspeaker-mounting board, said loudspeaker being disposed in usewithin said housing in axial alignment with said openings fortransmitting therethrough to the exterior of said housing sound wavesgenerated at the front surface of the diaphragm and for transmittinginto said housing sound waves generated at the rear surface of saidhousing, a rear cover panel disposed in said rear recess and secured tosaid rear wall, a sound-transmitting fabric screen secured to saidloudspeaker-mounting board and covering the outer surface thereof forconcealing the opening therein, and a decorative facing secured to saidtoP and bottom and side walls and said rear cover panel and covering theouter surfaces thereof, whereby the perpendicular corrugations of eachof said housing walls cooperate to facilitate the suppression by saidwalls of undesirable sound waves emitted from said housing.